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Thread: Problem with my 94 lebaron conv. With a 5 speed swap.

  1. #1
    Garrett booster
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    Problem with my 94 lebaron conv. With a 5 speed swap.

    Ok i did this swap about month and a half ago. When i bought the car 400 dollars cause a bad trans I figured y not put the a543 in it that i had laying around with most of everything that was needed to put it in cables and mounts. Now I did take for a ride with the auto in the car and it did it then too but really didn't notice since I wasn't giving it gas but after I got to drive it a lot with the 5speed it does it all the time. I can't give it more than i would say 1/3 of the peddle or it falls hard on its face. Now when not driving and under the hood giving it gas it will hit the limiter real quick with just like the 1/3 peddle now when you floor it it falls flat and can bearly rev at all and takes forever to to even get close to the limiter I stop when it falls flat like that. I think it is the fuel pump but i am going to try the filter first since it looks original than if it is still doing it and can't figure something else out I will do the pump. But please if u think it is something else let me know.

  2. #2
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    it can rev without load on it? but not when driving?

    check for codes and maybe try unlplugging your tps and see if that does anything. In my experience when the car falls flat on its face its either super lean or super friggin rich. wideband tells me that though. your sure its 100% in time?

  3. #3
    Garrett booster
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    I really been driving like this this while time u really never need more than it ran the tach don't work so i don't know the rpm but i guess it was around 3000 rpm it runs almost perfect and don't really need more than that to get around and to work. That's my real problem I have to still get to worth but so far nothing has helped.

    On another point when i swaped it the nutral safty switch I had grounded with a hidden momintary switch so i could start it and still use cruise. But found out after many test drives that if i held the button down it ran better before when it wasn't grounding the switch it ran worse. So i have it twisted it together for now to make it run better. Don't know what to make of that

  4. #4
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    weird.. NAJ on the other site knows alot about wiring.. maybe he can help with that one.

    i know when i had way to big of injectors with the stock ecu, i ran really rich but it drove just fine until i got to upper rpms and then it would just bog, as if i had hit a rev limiter.

    how is your mpg?

  5. #5
    Garrett booster
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    Around 26 25 mph

  6. #6
    turbo addict Turbo Mopar Contributor
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    You check the voltage sweep of the tps?
    that ground should do nothing to drivability. All it does it prevent starting. If it was actually causing something else, there is foreign voltage or something going on. I would think its not related but who knows. I removed a security device thing that was spliced into my yellow starter wire and spliced that back together. Now when my heater fan is on, it turns over but I get no spark.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  7. #7

    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    I would check all your ground straps... Sounds like grounding the switch is creating a secondary ground path...

  8. #8
    Garrett booster
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    Ok well its to dark to look tonight at the ground straps how many are there supposed to be I know of 2 for sure by the alt and by the passanger side motor mount

    ---------- Post added at 05:17 PM ---------- Previous post was at 05:16 PM ----------

    At what am I looking for there cause when i did check it with the scanner I have it seems to sweep fine just don't know if it is out of range or something

  9. #9
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    Maybe ditch the switch setup and cruise for now?

    I have only felt that dead feeling on a misfire from being rich or lean, etc. Fuel filter is a good thing to replace on a regular basis. Other fuel things are hard to diagnose without a pressure gauge.

    Sure you have no codes? Limp home mode SUCks to drive when its doing something like estimating MAP values etc.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  10. #10
    Garrett booster
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    I can check again with the scanner but there is no check engine light I checked the grounds and the 2 I said it had was there and I knew of one that needs a good cleaning but couldn't get to it in the time I had and today after work it was raining so couldn't clean it.

    I did leave the switch wires twisted together so it would be grounded and run better just wanted to find out if it was something i could fix

    Side note I got Offered a inline walbro and filter with 6an fittings for 50 bucks should I take it mind u I am on a TIGHT budget right now and the less money I spend the better plus needing to fix this car to be able to make it to work comes to mind but if it was u stock fuel filter for 25 bucks I think not sure. Or the walbro and filter for 50 and could I even run that stock setup not even a 52 mm throttle yet cause wanted it fixed. Was thinking I would at least need to run a adjustable frp. And maybe new lines too

  11. #11
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    Well the scary thing about the fuel filter is that you have to hope all the fuel lines are happy when you take them apart. Other filters are cheaper but you would need new fuel injection hose (not carb hose) to be safe long term because you wouldn't be able to use the quick connects. I just bought one and I thought it was cheaper then that....Fuel pump testing. I would hotwire the relay and run the pump with nothign else going so you can listen to it. Squeezing the return line might result in it behaving strange (weird sounds) or something. I have a video on my photobucket of a fuel pump running down in speed as the pressure demand is increased. Fuel pump should just get lower and lower pitched as it slows down.

    Also, you could try disconnecting the o2 sensor so you are stuck in open loop mode. That would be a silly little test you could try. It wouldnt' be trying to correct fueling based on o2 and should be overly rich if the fuel system is happy.

    Also, you could get on it real hard and make it bog, cut the ignition, pull over, and look at a few plugs to seee what was happening at the moment it was losing power.

    I bought a cheap vacuum pump at harbor freight for working on a Toyota Camry but ended up using it on my regulator. I had a fuel pressure gauge so I could read the pressure changes but you can hear the fuel pump changing pitch as well when you do the hotwire trick (no engine running so you can hear the pump).

    Cheapest would be you blowing or sucking on the reference line to the regulator. If you have a compressor that has a dial on the outlet pressure you could use that too.
    Vacuum will lower fuel pressure/increase pitch (pump is not working as hard), "boost" (blowing) will increase fuel pressure and decrease pitch (pump is working harder).

    Voltage check on the fuel pump. You do seem to be having a wiring issue. You would always "hotwire" the pump with a relay from the junkyard and some 12 gauge wire. Its super easy.


    Some of those mods you are talking about are pretty expensive and not necessary for a good running vehicle, even one making a lot more power. I did run into a clogged fuel filter, it collapsed, and the moment I replaced it my fueling problems went away and my tune was all of a sudden consistent. That was only in boost when fuel demands were higher.

    I would do the cheap tests first. Filter is something I would replace before trying too hard to fix things. Inline pump will work as long as your oem pump is working but it is overkill for anything you would be looking at doing anytime soon. Also those -an lines won't seem so awesome when you try to connect them to your oem fuel lines.

    Troubleshoot the fuel system including the wiring. Change the filter if you can afford it. I understand the temptation of getting a filter AND more stuff but make sure you won't spend more making it all work. The best fuel mod you can do is a hotwire assuming everything is working well. Still, its not necessary for any car making 100-200hp. Other upgrades would be for another day when your budget is happier and you have a good reason.
    Last edited by Ondonti; 12-06-2011 at 07:14 AM.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  12. #12
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    what if your making more than 200whp? im still rich at 11.5psi on the STOCK pump

    a healthy pump shouldnt have to hotwired at such a "low" power level imo

  13. #13
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    Yes it shouldn't, but thats the first upgrade I would ever do if I was trying to "upgrade" things. It won't fix any problems.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  14. #14
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    okay gotcha . i was reading and getting worried thinking that i might be pushing things to far

  15. #15
    Garrett booster
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    Well Tuesday is payday and i will be doing a fuel filter hopefully that day or might have to wait cause of work and weather doing everything outside

  16. #16
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    Well fuel filter was the problem runner almost perfect now will up date more when i have time

  17. #17
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    Keep the filter, cut off the top, show us the internals. Mine was crushed and obviously fairly clogged. I bet a stock pump won't put quite that hurting on clogged filter.

    Lean misfire seems to happen at 17:1 or higher depending on your load. Higher the load, the lower the ratio that it misfires on. Low load and you can run super lean (which is a trick for tuning for MPG's when you don't have a cat).
    Good job
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  18. #18
    Garrett booster
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    Re: Problem with my 94 lebaron conv. With a 5 speed swap.

    I did just that after i took it off and found it fixed it i wanted to see. There was nothing bad looking about it other than all the build up of crap clogging it and the color being very bad almost dark brown in color

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